Apple MacBook Pro 17-inch (original, Core 2 Duo, 2.4GHz, Late 2007 CTO, Early 2008, and Late 2008) - Manual (Page 192)

MacBook Pro 17-inch (original, Core 2 Duo, 2.4/2.6GHz, 2008) Troubleshooting — Hardware Symptom Charts 192
Try a different DVI-to-Video Adapter. 3.
Replace the logic board. 4.
No video on external VGA device connected to the external monitor (DVI) port
Verify that the test monitor being used is a known-good device supported by this computer. 5.
Try a different DVI-to-VGA adapter cable. 6.
Restart the computer and test again. 7.
Replace the logic board. 8.
Display has repetitive patterns or shifting color pattern
Check for the latest system software update. 1.
Check that the LVDS connection is fully seated on the logic board. 2.
Hook up an external display. If the external video displays the mirrored image correctly, 3.
replace the display assembly.
Replace the logic board. 4.
Display has permanent vertical or horizontal lines.
Check for the latest System software update 1.
Check that the LVDS connection is fully seated on the logic board. 2.
Hook up an external display. If the external video displays the mirrored image correctly, 3.
replace the display assembly.
Replace the logic board. 4.
Miscellaneous Symptoms
The Date and Time settings reset repeatedly
Note: Resetting the power manager and/or PRAM resets the date and time. The MacBook Pro
uses a non-rechargeable lithium battery.
Do a backup battery test: 1.
Set the date and time. •
Perform a Shut Down from the Apple menu. •
Remove the main battery and disconnect the power adapter for 10 minutes. •
Connect the power adapter, insert the battery, and power on the computer. •
If the date and time were lost the backup battery may be dead or discharged. •
Remove main battery from the unit and leave it plugged in for at least 5 hours. •
Replace the backup battery. 2.
Replace the logic board. 3.